Boston Red Sox vs. Cleveland Guardians

Platform comparison

Active sub-markets

Market context

The Boston Red Sox face the Cleveland Guardians on 29 May at 7:10 PM ET in a regular-season matchup. The current 18% implied probability for a Red Sox victory suggests market participants favour the Guardians as the stronger proposition heading into this fixture. Settlement occurs on 5 June, providing a five-day window after the scheduled game date to account for potential postponements.

Historical matchup data and recent form establish the baseline for evaluating this probability. The Red Sox finished 2024 with a 84–78 record, whilst Cleveland posted 92–70, reflecting a 16-game differential in win-loss performance. Head-to-head records between these franchises over the past three seasons show the Guardians holding a marginal advantage in direct competition. Comparable games where the favourite carried 80+ implied probability have typically resolved correctly 75–80% of the time in MLB contexts, suggesting the current 82% lean towards Cleveland aligns with historical accuracy rates for such disparities.

Traders monitoring this market should track roster availability announcements through 28 May, particularly regarding starting pitcher assignments and injury updates. Recent Cleveland roster moves and Red Sox bullpen depth constitute material variables; ESPN's injury tracker and official MLB transaction feeds provide real-time data. Weather conditions at the venue and any late-schedule adjustments warrant programmatic monitoring, as these factors influence game outcomes disproportionately in May fixtures. Conditional order logic should account for the postponement clause, which keeps the market open until completion if weather forces rescheduling.

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket App UK, which mirrors the Polymarket order book directly.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

On Polymarket App UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket App UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What does it cost to trade on Polymarket App UK?

Zero. Polymarket App UK routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Polymarket App UK triggers a quick verification flow that finishes in minutes.